i think you can achieve it with default.
e.g. 
Field('f_status_change_dt', type='datetime',
          label=T('Status Change Dt')*, default=request.now*)

or if you set auth.signature or record_versioning, web2py automatically do 
that for you.

ref:
http://web2py.com/books/default/chapter/29/06/the-database-abstraction-layer#Record-versioning
http://web2py.com/books/default/chapter/29/09/access-control#Record-versioning

best regards,
stifan

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